[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fOCvjeVG8z2EPIgGWuEQJ_ctnIoDDf_BsASgbTHwiF_g":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":28,"type":29},[],"2023-12-19 09:30:38",104988229,[8,9,10,11],"3.0","-4.0","4.0","-3.0",{"courseId":13,"courseImg":14,"courseName":15},"f77170d831cb6c74878b10922f9203e8","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4122f0dbe8bbd5f23415deb5d21b1dd7.jpg","电磁场理论","设某静电场的电位移矢量\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1e4ef9207263c6b6670ae815eada4d8f.png\">,则(2,-1,3)点处的电荷密度数值为( )C\u002Fm3",[18,30,40,49,59,69,77,86,95,98],{"answer":19,"createTime":20,"id":21,"options":22,"question":27,"source":28,"type":29},[],"2023-12-19 09:30:39",104988214,[23,24,25,26],"8.85×10-12F\u002Fm","8.85×10-11F\u002Fm","8.85×10-9F\u002Fm","8.85×10-10F\u002Fm","真空中介电常数ε0的值为( )","v1",0,{"answer":31,"createTime":32,"id":33,"options":34,"question":39,"source":28,"type":29},[],"2023-12-22 13:20:50",104988216,[35,36,37,38],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb6d4903ca52a37a7080422c6fcc6624d.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff1c031cb0da7bbe842c149c4ad9cd76d.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F13b3624cfac6842783da01bdf11f0b0e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F72a7c6ce80f356ad508dfea08c91175c.png\">","设z<0区域为εr1=2.5的介质,z>0区域为εr2=4的介质,令\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6f2f1ad7ef434d7e214559eacbc88740.png\"> , 则\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F313fe89f2ca2beb4b65090cf8ddfcb0e.png\">为( )",{"answer":41,"createTime":32,"id":42,"options":43,"question":48,"source":28,"type":29},[],104988218,[44,45,46,47],"▽×E","▽E","▽2×E","▽·E","电场强度E的旋度表示为( )",{"answer":50,"createTime":51,"id":52,"options":53,"question":58,"source":28,"type":29},[],"2023-12-22 15:04:52",104988220,[54,55,56,57],"▽×φ","▽·φ","▽φ","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa7c2b156c82950f1838cff2c1738ea6d.webp\">","电位梯度的表示式为( )",{"answer":60,"createTime":61,"id":62,"options":63,"question":68,"source":28,"type":29},[],"2023-11-19 23:02:04",104988222,[64,65,66,67],"不确定","增大","不变","减小","孤立导体球周围电介质的介电常数增大时,球体电位( )",{"answer":70,"createTime":32,"id":71,"options":72,"question":76,"source":28,"type":29},[],104988225,[64,73,74,75],"不为零","为零","为常数","导体在静电平衡下,其内部电场强度( )",{"answer":78,"createTime":51,"id":79,"options":80,"question":85,"source":28,"type":29},[],104988226,[81,82,83,84],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcf6b9ceac5d5e8f20affd104280b1613.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9a09c98bccfbf161a45303e01fa8d3f3.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F10b04d15cca28bfd147044888d5444c1.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fac5a8f007c0ab1f7c177262f58a2e6d1.png\">","图示某半径为a的半圆形导线,其上电荷线密度τ=asinα,则圆心处的电场强度为( ). \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F04fe91c06bd9f3c590a21ce9fab42bdf.png\">",{"answer":87,"createTime":51,"id":88,"options":89,"question":94,"source":28,"type":29},[],104988228,[90,91,92,93],"无源场","有源场","无旋场","有旋场","高斯通量定理说明静电场是( )",{"answer":96,"createTime":5,"id":6,"options":97,"question":16,"source":28,"type":29},[],[8,9,10,11],{"answer":99,"createTime":32,"id":100,"options":101,"question":106,"source":28,"type":29},[],104988230,[102,103,104,105],"极板上的电荷量变为原来的ε倍,电场强度不变","极板上的电荷量不变,电场强度也不变","极板上的电荷量变为原来的ε倍,电场强度变为原来的1\u002Fε倍","极板上的电荷量不变,电场强度变为原来的1\u002Fε倍","将平行板电容器充电后拆掉电源,然后再加入电容率为ε的电介质,则以下说法正确的是"]